/* BGP message definition header.
   Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

GNU Zebra is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

/* For union sockunion.  */
#include "sockunion.h"

/* Typedef BGP specific types.  */
typedef u_int16_t as_t;
typedef u_int16_t bgp_size_t;

/* BGP master for system wide configurations and variables.  */
struct bgp_master
{
  /* BGP instance list.  */
  struct list *bgp;

  /* BGP thread master.  */
  struct thread_master *master;

  /* BGP port number.  */
  u_int16_t port;

  /* BGP start time.  */
  time_t start_time;

  /* Various BGP global configuration.  */
  u_char options;
#define BGP_OPT_NO_FIB                   (1 << 0)
#define BGP_OPT_MULTIPLE_INSTANCE        (1 << 1)
#define BGP_OPT_CONFIG_CISCO             (1 << 2)
};

/* BGP instance structure.  */
struct bgp 
{
  /* AS number of this BGP instance.  */
  as_t as;

  /* Name of this BGP instance.  */
  char *name;

  /* Self peer.  */
  struct peer *peer_self;

  /* BGP peer. */
  struct list *peer;

  /* BGP peer group.  */
  struct list *group;

  /* BGP route-server-clients. */
  struct list *rsclient;

  /* BGP configuration.  */
  u_int16_t config;
#define BGP_CONFIG_ROUTER_ID              (1 << 0)
#define BGP_CONFIG_CLUSTER_ID             (1 << 1)
#define BGP_CONFIG_CONFEDERATION          (1 << 2)

  /* BGP router identifier.  */
  struct in_addr router_id;
  struct in_addr router_id_static;

  /* BGP route reflector cluster ID.  */
  struct in_addr cluster_id;

  /* BGP confederation information.  */
  as_t confed_id;
  as_t *confed_peers;
  int confed_peers_cnt;

  /* BGP flags. */
  u_int16_t flags;
#define BGP_FLAG_ALWAYS_COMPARE_MED       (1 << 0)
#define BGP_FLAG_DETERMINISTIC_MED        (1 << 1)
#define BGP_FLAG_MED_MISSING_AS_WORST     (1 << 2)
#define BGP_FLAG_MED_CONFED               (1 << 3)
#define BGP_FLAG_NO_DEFAULT_IPV4          (1 << 4)
#define BGP_FLAG_NO_CLIENT_TO_CLIENT      (1 << 5)
#define BGP_FLAG_ENFORCE_FIRST_AS         (1 << 6)
#define BGP_FLAG_COMPARE_ROUTER_ID        (1 << 7)
#define BGP_FLAG_ASPATH_IGNORE            (1 << 8)
#define BGP_FLAG_IMPORT_CHECK             (1 << 9)
#define BGP_FLAG_NO_FAST_EXT_FAILOVER     (1 << 10)
#define BGP_FLAG_LOG_NEIGHBOR_CHANGES     (1 << 11)
#define BGP_FLAG_GRACEFUL_RESTART         (1 << 12)

  /* BGP Per AF flags */
  u_int16_t af_flags[AFI_MAX][SAFI_MAX];
#define BGP_CONFIG_DAMPENING              (1 << 0)

  /* Static route configuration.  */
  struct bgp_table *route[AFI_MAX][SAFI_MAX];

  /* Aggregate address configuration.  */
  struct bgp_table *aggregate[AFI_MAX][SAFI_MAX];

  /* BGP routing information base.  */
  struct bgp_table *rib[AFI_MAX][SAFI_MAX];

  /* BGP redistribute configuration. */
  u_char redist[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP redistribute metric configuration. */
  u_char redist_metric_flag[AFI_MAX][ZEBRA_ROUTE_MAX];
  u_int32_t redist_metric[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP redistribute route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } rmap[AFI_MAX][ZEBRA_ROUTE_MAX];

  /* BGP distance configuration.  */
  u_char distance_ebgp;
  u_char distance_ibgp;
  u_char distance_local;
  
  /* BGP default local-preference.  */
  u_int32_t default_local_pref;

  /* BGP default timer.  */
  u_int32_t default_holdtime;
  u_int32_t default_keepalive;

  /* BGP graceful restart */
  u_int32_t restart_time;
  u_int32_t stalepath_time;
};

/* BGP peer-group support. */
struct peer_group
{
  /* Name of the peer-group. */
  char *name;

  /* Pointer to BGP.  */
  struct bgp *bgp;
  
  /* Peer-group client list. */
  struct list *peer;

  /* Peer-group config */
  struct peer *conf;
};

/* BGP Notify message format. */
struct bgp_notify 
{
  u_char code;
  u_char subcode;
  char *data;
  bgp_size_t length;
};

/* Next hop self address. */
struct bgp_nexthop
{
  struct interface *ifp;
  struct in_addr v4;
#ifdef HAVE_IPV6
  struct in6_addr v6_global;
  struct in6_addr v6_local;
#endif /* HAVE_IPV6 */  
};

/* BGP router distinguisher value.  */
#define BGP_RD_SIZE                8

struct bgp_rd
{
  u_char val[BGP_RD_SIZE];
};

#define RMAP_IN           0
#define RMAP_OUT        1
#define RMAP_IMPORT   2
#define RMAP_EXPORT   3
#define RMAP_MAX        4

/* BGP filter structure. */
struct bgp_filter
{
  /* Distribute-list.  */
  struct 
  {
    char *name;
    struct access_list *alist;
  } dlist[FILTER_MAX];

  /* Prefix-list.  */
  struct
  {
    char *name;
    struct prefix_list *plist;
  } plist[FILTER_MAX];

  /* Filter-list.  */
  struct
  {
    char *name;
    struct as_list *aslist;
  } aslist[FILTER_MAX];

  /* Route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } map[RMAP_MAX];

  /* Unsuppress-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } usmap;
};

/* BGP neighbor structure. */
struct peer
{
  /* BGP structure.  */
  struct bgp *bgp;

  /* BGP peer group.  */
  struct peer_group *group;
  u_char af_group[AFI_MAX][SAFI_MAX];

  /* Peer's remote AS number. */
  as_t as;			

  /* Peer's local AS number. */
  as_t local_as;

  /* Peer's Change local AS number. */
  as_t change_local_as;

  /* Remote router ID. */
  struct in_addr remote_id;

  /* Local router ID. */
  struct in_addr local_id;

  /* Peer specific RIB when configured as route-server-client. */
  struct bgp_table *rib[AFI_MAX][SAFI_MAX];

  /* Packet receive and send buffer. */
  struct stream *ibuf;
  struct stream_fifo *obuf;
  struct stream *work;

  /* Status of the peer. */
  int status;
  int ostatus;

  /* Peer information */
  int fd;			/* File descriptor */
  int ttl;			/* TTL of TCP connection to the peer. */
  char *desc;			/* Description of the peer. */
  unsigned short port;          /* Destination port for peer */
  char *host;			/* Printable address of the peer. */
  union sockunion su;		/* Sockunion address of the peer. */
  time_t uptime;		/* Last Up/Down time */
  time_t readtime;		/* Last read time */
  time_t resettime;		/* Last reset time */
  
  unsigned int ifindex;		/* ifindex of the BGP connection. */
  char *ifname;			/* bind interface name. */
  char *update_if;
  union sockunion *update_source;
  struct zlog *log;

  union sockunion *su_local;	/* Sockunion of local address.  */
  union sockunion *su_remote;	/* Sockunion of remote address.  */
  int shared_network;		/* Is this peer shared same network. */
  struct bgp_nexthop nexthop;	/* Nexthop */

  /* Peer address family configuration. */
  u_char afc[AFI_MAX][SAFI_MAX];
  u_char afc_nego[AFI_MAX][SAFI_MAX];
  u_char afc_adv[AFI_MAX][SAFI_MAX];
  u_char afc_recv[AFI_MAX][SAFI_MAX];

  /* Capability flags (reset in bgp_stop) */
  u_char cap;
#define PEER_CAP_REFRESH_ADV                (1 << 0) /* refresh advertised */
#define PEER_CAP_REFRESH_OLD_RCV            (1 << 1) /* refresh old received */
#define PEER_CAP_REFRESH_NEW_RCV            (1 << 2) /* refresh rfc received */
#define PEER_CAP_DYNAMIC_ADV                (1 << 3) /* dynamic advertised */
#define PEER_CAP_DYNAMIC_RCV                (1 << 4) /* dynamic received */
#define PEER_CAP_RESTART_ADV                (1 << 5) /* restart advertised */
#define PEER_CAP_RESTART_RCV                (1 << 6) /* restart received */

  /* Capability flags (reset in bgp_stop) */
  u_int16_t af_cap[AFI_MAX][SAFI_MAX];
#define PEER_CAP_ORF_PREFIX_SM_ADV          (1 << 0) /* send-mode advertised */
#define PEER_CAP_ORF_PREFIX_RM_ADV          (1 << 1) /* receive-mode advertised */
#define PEER_CAP_ORF_PREFIX_SM_RCV          (1 << 2) /* send-mode received */
#define PEER_CAP_ORF_PREFIX_RM_RCV          (1 << 3) /* receive-mode received */
#define PEER_CAP_ORF_PREFIX_SM_OLD_RCV      (1 << 4) /* send-mode received */
#define PEER_CAP_ORF_PREFIX_RM_OLD_RCV      (1 << 5) /* receive-mode received */
#define PEER_CAP_RESTART_AF_RCV             (1 << 6) /* graceful restart afi/safi received */
#define PEER_CAP_RESTART_AF_PRESERVE_RCV    (1 << 7) /* graceful restart afi/safi F-bit received */

  /* Global configuration flags. */
  u_int32_t flags;
#define PEER_FLAG_PASSIVE                   (1 << 0) /* passive mode */
#define PEER_FLAG_SHUTDOWN                  (1 << 1) /* shutdown */
#define PEER_FLAG_DONT_CAPABILITY           (1 << 2) /* dont-capability */
#define PEER_FLAG_OVERRIDE_CAPABILITY       (1 << 3) /* override-capability */
#define PEER_FLAG_STRICT_CAP_MATCH          (1 << 4) /* strict-match */
#define PEER_FLAG_DYNAMIC_CAPABILITY        (1 << 5) /* dynamic capability */
#define PEER_FLAG_DISABLE_CONNECTED_CHECK   (1 << 6) /* disable-connected-check */
#define PEER_FLAG_LOCAL_AS_NO_PREPEND       (1 << 7) /* local-as no-prepend */

  /* NSF mode (graceful restart) */
  u_char nsf[AFI_MAX][SAFI_MAX];

  /* Per AF configuration flags. */
  u_int32_t af_flags[AFI_MAX][SAFI_MAX];
#define PEER_FLAG_SEND_COMMUNITY            (1 << 0) /* send-community */
#define PEER_FLAG_SEND_EXT_COMMUNITY        (1 << 1) /* send-community ext. */
#define PEER_FLAG_NEXTHOP_SELF              (1 << 2) /* next-hop-self */
#define PEER_FLAG_REFLECTOR_CLIENT          (1 << 3) /* reflector-client */
#define PEER_FLAG_RSERVER_CLIENT            (1 << 4) /* route-server-client */
#define PEER_FLAG_SOFT_RECONFIG             (1 << 5) /* soft-reconfiguration */
#define PEER_FLAG_AS_PATH_UNCHANGED         (1 << 6) /* transparent-as */
#define PEER_FLAG_NEXTHOP_UNCHANGED         (1 << 7) /* transparent-next-hop */
#define PEER_FLAG_MED_UNCHANGED             (1 << 8) /* transparent-next-hop */
#define PEER_FLAG_DEFAULT_ORIGINATE         (1 << 9) /* default-originate */
#define PEER_FLAG_REMOVE_PRIVATE_AS         (1 << 10) /* remove-private-as */
#define PEER_FLAG_ALLOWAS_IN                (1 << 11) /* set allowas-in */
#define PEER_FLAG_ORF_PREFIX_SM             (1 << 12) /* orf capability send-mode */
#define PEER_FLAG_ORF_PREFIX_RM             (1 << 13) /* orf capability receive-mode */
#define PEER_FLAG_MAX_PREFIX                (1 << 14) /* maximum prefix */
#define PEER_FLAG_MAX_PREFIX_WARNING        (1 << 15) /* maximum prefix warning-only */
#define PEER_FLAG_NEXTHOP_LOCAL_UNCHANGED   (1 << 16) /* leave link-local nexthop unchanged */ 

  /* default-originate route-map.  */
  struct
  {
    char *name;
    struct route_map *map;
  } default_rmap[AFI_MAX][SAFI_MAX];

  /* Peer status flags. */
  u_int16_t sflags;
#define PEER_STATUS_ACCEPT_PEER	      (1 << 0) /* accept peer */
#define PEER_STATUS_PREFIX_OVERFLOW   (1 << 1) /* prefix-overflow */
#define PEER_STATUS_CAPABILITY_OPEN   (1 << 2) /* capability open send */
#define PEER_STATUS_HAVE_ACCEPT       (1 << 3) /* accept peer's parent */
#define PEER_STATUS_GROUP             (1 << 4) /* peer-group conf */
#define PEER_STATUS_NSF_MODE          (1 << 5) /* NSF aware peer */
#define PEER_STATUS_NSF_WAIT          (1 << 6) /* wait comeback peer */

  /* Peer status af flags (reset in bgp_stop) */
  u_int16_t af_sflags[AFI_MAX][SAFI_MAX];
#define PEER_STATUS_ORF_PREFIX_SEND   (1 << 0) /* prefix-list send peer */
#define PEER_STATUS_ORF_WAIT_REFRESH  (1 << 1) /* wait refresh received peer */
#define PEER_STATUS_DEFAULT_ORIGINATE (1 << 2) /* default-originate peer */
#define PEER_STATUS_PREFIX_THRESHOLD  (1 << 3) /* exceed prefix-threshold */
#define PEER_STATUS_PREFIX_LIMIT      (1 << 4) /* exceed prefix-limit */
#define PEER_STATUS_EOR_SEND          (1 << 5) /* end-of-rib send to peer */
#define PEER_STATUS_EOR_RECEIVED      (1 << 6) /* end-of-rib received from peer */


  /* Default attribute value for the peer. */
  u_int32_t config;
#define PEER_CONFIG_WEIGHT            (1 << 0) /* Default weight. */
#define PEER_CONFIG_TIMER             (1 << 1) /* keepalive & holdtime */
#define PEER_CONFIG_CONNECT           (1 << 2) /* connect */
#define PEER_CONFIG_ROUTEADV          (1 << 3) /* route advertise */
  u_int32_t weight;
  u_int32_t holdtime;
  u_int32_t keepalive;
  u_int32_t connect;
  u_int32_t routeadv;

  /* Timer values. */
  u_int32_t v_start;
  u_int32_t v_connect;
  u_int32_t v_holdtime;
  u_int32_t v_keepalive;
  u_int32_t v_asorig;
  u_int32_t v_routeadv;
  u_int32_t v_pmax_restart;
  u_int32_t v_gr_restart;

  /* Threads. */
  struct thread *t_read;
  struct thread *t_write;
  struct thread *t_start;
  struct thread *t_connect;
  struct thread *t_holdtime;
  struct thread *t_keepalive;
  struct thread *t_asorig;
  struct thread *t_routeadv;
  struct thread *t_pmax_restart;
  struct thread *t_gr_restart;
  struct thread *t_gr_stale;

  /* Statistics field */
  u_int32_t open_in;		/* Open message input count */
  u_int32_t open_out;		/* Open message output count */
  u_int32_t update_in;		/* Update message input count */
  u_int32_t update_out;		/* Update message ouput count */
  time_t update_time;		/* Update message received time. */
  u_int32_t keepalive_in;	/* Keepalive input count */
  u_int32_t keepalive_out;	/* Keepalive output count */
  u_int32_t notify_in;		/* Notify input count */
  u_int32_t notify_out;		/* Notify output count */
  u_int32_t refresh_in;		/* Route Refresh input count */
  u_int32_t refresh_out;	/* Route Refresh output count */
  u_int32_t dynamic_cap_in;	/* Dynamic Capability input count.  */
  u_int32_t dynamic_cap_out;	/* Dynamic Capability output count.  */

  /* BGP state count */
  u_int32_t established;	/* Established */
  u_int32_t dropped;		/* Dropped */

  /* Syncronization list and time.  */
  struct bgp_synchronize *sync[AFI_MAX][SAFI_MAX];
  time_t synctime;

  /* Send prefix count. */
  unsigned long scount[AFI_MAX][SAFI_MAX];

  /* Announcement attribute hash.  */
  struct hash *hash[AFI_MAX][SAFI_MAX];

  /* Notify data. */
  struct bgp_notify notify;

  /* Whole packet size to be read. */
  unsigned long packet_size;

  /* Filter structure. */
  struct bgp_filter filter[AFI_MAX][SAFI_MAX];

  /* ORF Prefix-list */
  struct prefix_list *orf_plist[AFI_MAX][SAFI_MAX];

  /* Prefix count. */
  unsigned long pcount[AFI_MAX][SAFI_MAX];

  /* Max prefix count. */
  unsigned long pmax[AFI_MAX][SAFI_MAX];
  u_char pmax_threshold[AFI_MAX][SAFI_MAX];
  u_int16_t pmax_restart[AFI_MAX][SAFI_MAX];
#define MAXIMUM_PREFIX_THRESHOLD_DEFAULT 75

  /* allowas-in. */
  char allowas_in[AFI_MAX][SAFI_MAX];

  /* peer reset cause */
  char last_reset;
#define PEER_DOWN_RID_CHANGE             1 /* bgp router-id command */
#define PEER_DOWN_REMOTE_AS_CHANGE       2 /* neighbor remote-as command */
#define PEER_DOWN_LOCAL_AS_CHANGE        3 /* neighbor local-as command */
#define PEER_DOWN_CLID_CHANGE            4 /* bgp cluster-id command */
#define PEER_DOWN_CONFED_ID_CHANGE       5 /* bgp confederation identifier command */
#define PEER_DOWN_CONFED_PEER_CHANGE     6 /* bgp confederation peer command */
#define PEER_DOWN_RR_CLIENT_CHANGE       7 /* neighbor route-reflector-client command */
#define PEER_DOWN_RS_CLIENT_CHANGE       8 /* neighbor route-server-client command */
#define PEER_DOWN_UPDATE_SOURCE_CHANGE   9 /* neighbor update-source command */
#define PEER_DOWN_AF_ACTIVATE           10 /* neighbor activate command */
#define PEER_DOWN_USER_SHUTDOWN         11 /* neighbor shutdown command */
#define PEER_DOWN_USER_RESET            12 /* clear ip bgp command */
#define PEER_DOWN_NOTIFY_RECEIVED       13 /* notification received */
#define PEER_DOWN_NOTIFY_SEND           14 /* notification send */
#define PEER_DOWN_CLOSE_SESSION         15 /* tcp session close */
#define PEER_DOWN_NEIGHBOR_DELETE       16 /* neghbor delete */
#define PEER_DOWN_RMAP_BIND             17 /* neghbor peer-group command */
#define PEER_DOWN_RMAP_UNBIND           18 /* no neighbor peer-group command */
#define PEER_DOWN_CAPABILITY_CHANGE     19 /* neighbor capability command */
#define PEER_DOWN_PASSIVE_CHANGE        20 /* neighbor passive command */
#define PEER_DOWN_MULTIHOP_CHANGE       21 /* neighbor multihop command */
#define PEER_DOWN_NSF_CLOSE_SESSION     22 /* NSF tcp session close */

  /* The kind of route-map Flags.*/
  u_char rmap_type;
#define PEER_RMAP_TYPE_IN             (1 << 0) /* neighbor route-map in */
#define PEER_RMAP_TYPE_OUT            (1 << 1) /* neighbor route-map out */
#define PEER_RMAP_TYPE_NETWORK        (1 << 2) /* network route-map */
#define PEER_RMAP_TYPE_REDISTRIBUTE   (1 << 3) /* redistribute route-map */
#define PEER_RMAP_TYPE_DEFAULT        (1 << 4) /* default-originate route-map */
#define PEER_RMAP_TYPE_NOSET          (1 << 5) /* not allow to set commands */
#define PEER_RMAP_TYPE_IMPORT         (1 << 6) /* neighbor route-map import */
#define PEER_RMAP_TYPE_EXPORT         (1 << 7) /* neighbor route-map export */
};

/* This structure's member directly points incoming packet data
   stream. */
struct bgp_nlri
{
  /* AFI.  */
  afi_t afi;

  /* SAFI.  */
  safi_t safi;

  /* Pointer to NLRI byte stream.  */
  u_char *nlri;

  /* Length of whole NLRI.  */
  bgp_size_t length;
};

/* BGP versions.  */
#define BGP_VERSION_4		                 4

/* Default BGP port number.  */
#define BGP_PORT_DEFAULT                       179

/* BGP message header and packet size.  */
#define BGP_MARKER_SIZE		                16
#define BGP_HEADER_SIZE		                19
#define BGP_MAX_PACKET_SIZE                   4096

/* BGP minimum message size.  */
#define BGP_MSG_OPEN_MIN_SIZE                   (BGP_HEADER_SIZE + 10)
#define BGP_MSG_UPDATE_MIN_SIZE                 (BGP_HEADER_SIZE + 4)
#define BGP_MSG_NOTIFY_MIN_SIZE                 (BGP_HEADER_SIZE + 2)
#define BGP_MSG_KEEPALIVE_MIN_SIZE              (BGP_HEADER_SIZE + 0)
#define BGP_MSG_ROUTE_REFRESH_MIN_SIZE          (BGP_HEADER_SIZE + 4)
#define BGP_MSG_CAPABILITY_MIN_SIZE             (BGP_HEADER_SIZE + 3)

/* BGP message types.  */
#define	BGP_MSG_OPEN		                 1
#define	BGP_MSG_UPDATE		                 2
#define	BGP_MSG_NOTIFY		                 3
#define	BGP_MSG_KEEPALIVE	                 4
#define BGP_MSG_ROUTE_REFRESH_NEW                5
#define BGP_MSG_CAPABILITY                       6
#define BGP_MSG_ROUTE_REFRESH_OLD              128

/* BGP open optional parameter.  */
#define BGP_OPEN_OPT_AUTH                        1
#define BGP_OPEN_OPT_CAP                         2

/* BGP4 attribute type codes.  */
#define BGP_ATTR_ORIGIN                          1
#define BGP_ATTR_AS_PATH                         2
#define BGP_ATTR_NEXT_HOP                        3
#define BGP_ATTR_MULTI_EXIT_DISC                 4
#define BGP_ATTR_LOCAL_PREF                      5
#define BGP_ATTR_ATOMIC_AGGREGATE                6
#define BGP_ATTR_AGGREGATOR                      7
#define BGP_ATTR_COMMUNITIES                     8
#define BGP_ATTR_ORIGINATOR_ID                   9
#define BGP_ATTR_CLUSTER_LIST                   10
#define BGP_ATTR_DPA                            11
#define BGP_ATTR_ADVERTISER                     12
#define BGP_ATTR_RCID_PATH                      13
#define BGP_ATTR_MP_REACH_NLRI                  14
#define BGP_ATTR_MP_UNREACH_NLRI                15
#define BGP_ATTR_EXT_COMMUNITIES                16

/* BGP update origin.  */
#define BGP_ORIGIN_IGP                           0
#define BGP_ORIGIN_EGP                           1
#define BGP_ORIGIN_INCOMPLETE                    2

/* BGP notify message codes.  */
#define BGP_NOTIFY_HEADER_ERR                    1
#define BGP_NOTIFY_OPEN_ERR                      2
#define BGP_NOTIFY_UPDATE_ERR                    3
#define BGP_NOTIFY_HOLD_ERR                      4
#define BGP_NOTIFY_FSM_ERR                       5
#define BGP_NOTIFY_CEASE                         6
#define BGP_NOTIFY_CAPABILITY_ERR                7
#define BGP_NOTIFY_MAX	                         8

/* BGP_NOTIFY_HEADER_ERR sub codes.  */
#define BGP_NOTIFY_HEADER_NOT_SYNC               1
#define BGP_NOTIFY_HEADER_BAD_MESLEN             2
#define BGP_NOTIFY_HEADER_BAD_MESTYPE            3
#define BGP_NOTIFY_HEADER_MAX                    4

/* BGP_NOTIFY_OPEN_ERR sub codes.  */
#define BGP_NOTIFY_OPEN_UNSUP_VERSION            1
#define BGP_NOTIFY_OPEN_BAD_PEER_AS              2
#define BGP_NOTIFY_OPEN_BAD_BGP_IDENT            3
#define BGP_NOTIFY_OPEN_UNSUP_PARAM              4
#define BGP_NOTIFY_OPEN_AUTH_FAILURE             5
#define BGP_NOTIFY_OPEN_UNACEP_HOLDTIME          6
#define BGP_NOTIFY_OPEN_UNSUP_CAPBL              7
#define BGP_NOTIFY_OPEN_MAX                      8

/* BGP_NOTIFY_UPDATE_ERR sub codes.  */
#define BGP_NOTIFY_UPDATE_MAL_ATTR               1
#define BGP_NOTIFY_UPDATE_UNREC_ATTR             2
#define BGP_NOTIFY_UPDATE_MISS_ATTR              3
#define BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR          4
#define BGP_NOTIFY_UPDATE_ATTR_LENG_ERR          5
#define BGP_NOTIFY_UPDATE_INVAL_ORIGIN           6
#define BGP_NOTIFY_UPDATE_AS_ROUTE_LOOP          7
#define BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP         8
#define BGP_NOTIFY_UPDATE_OPT_ATTR_ERR           9
#define BGP_NOTIFY_UPDATE_INVAL_NETWORK         10
#define BGP_NOTIFY_UPDATE_MAL_AS_PATH           11
#define BGP_NOTIFY_UPDATE_MAX                   12

/* BGP_NOTIFY_CEASE sub codes (draft-ietf-idr-cease-subcode-05).  */
#define BGP_NOTIFY_CEASE_MAX_PREFIX              1
#define BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN          2
#define BGP_NOTIFY_CEASE_PEER_UNCONFIG           3
#define BGP_NOTIFY_CEASE_ADMIN_RESET             4
#define BGP_NOTIFY_CEASE_CONNECT_REJECT          5
#define BGP_NOTIFY_CEASE_CONFIG_CHANGE           6
#define BGP_NOTIFY_CEASE_COLLISION_RESOLUTION    7
#define BGP_NOTIFY_CEASE_OUT_OF_RESOURCE         8
#define BGP_NOTIFY_CEASE_MAX                     9

/* BGP_NOTIFY_CAPABILITY_ERR sub codes (draft-ietf-idr-dynamic-cap-02). */
#define BGP_NOTIFY_CAPABILITY_INVALID_ACTION     1
#define BGP_NOTIFY_CAPABILITY_INVALID_LENGTH     2
#define BGP_NOTIFY_CAPABILITY_MALFORMED_CODE     3
#define BGP_NOTIFY_CAPABILITY_MAX                4

/* BGP finite state machine status.  */
#define Idle                                     1
#define Connect                                  2
#define Active                                   3
#define OpenSent                                 4
#define OpenConfirm                              5
#define Established                              6
#define BGP_STATUS_MAX                           7

/* BGP finite state machine events.  */
#define BGP_Start                                1
#define BGP_Stop                                 2
#define TCP_connection_open                      3
#define TCP_connection_closed                    4
#define TCP_connection_open_failed               5
#define TCP_fatal_error                          6
#define ConnectRetry_timer_expired               7
#define Hold_Timer_expired                       8
#define KeepAlive_timer_expired                  9
#define Receive_OPEN_message                    10
#define Receive_KEEPALIVE_message               11
#define Receive_UPDATE_message                  12
#define Receive_NOTIFICATION_message            13
#define BGP_EVENTS_MAX                          14

/* BGP timers default value.  */
#define BGP_INIT_START_TIMER                     5
#define BGP_ERROR_START_TIMER                   30
#define BGP_DEFAULT_HOLDTIME                   180
#define BGP_DEFAULT_KEEPALIVE                   60 
#define BGP_DEFAULT_ASORIGINATE                 15
#define BGP_DEFAULT_EBGP_ROUTEADV               30
#define BGP_DEFAULT_IBGP_ROUTEADV                5
#define BGP_CLEAR_CONNECT_RETRY                 20
#define BGP_DEFAULT_CONNECT_RETRY              120

/* BGP default local preference.  */
#define BGP_DEFAULT_LOCAL_PREF                 100

/* BGP graceful restart  */
#define BGP_DEFAULT_RESTART_TIME               120
#define BGP_DEFAULT_STALEPATH_TIME             360

/* SAFI which used in open capability negotiation.  */
#define BGP_SAFI_VPNV4                         128
#define BGP_SAFI_VPNV6                         129

/* Max TTL value.  */
#define TTL_MAX                                255

/* BGP uptime string length.  */
#define BGP_UPTIME_LEN 25

/* Default configuration settings for bgpd.  */
#define BGP_VTY_PORT                          2605
#define BGP_DEFAULT_CONFIG             "bgpd.conf"

/* Check AS path loop when we send NLRI.  */
/* #define BGP_SEND_ASPATH_CHECK */

/* IBGP/EBGP identifier.  We also have a CONFED peer, which is to say,
   a peer who's AS is part of our Confederation.  */
enum
{
  BGP_PEER_IBGP,
  BGP_PEER_EBGP,
  BGP_PEER_INTERNAL,
  BGP_PEER_CONFED
};

/* Flag for peer_clear_soft().  */
enum bgp_clear_type
{
  BGP_CLEAR_SOFT_NONE,
  BGP_CLEAR_SOFT_OUT,
  BGP_CLEAR_SOFT_IN,
  BGP_CLEAR_SOFT_BOTH,
  BGP_CLEAR_SOFT_IN_ORF_PREFIX,
  BGP_CLEAR_SOFT_RSCLIENT
};

/* Macros. */
#define BGP_INPUT(P)         ((P)->ibuf)
#define BGP_INPUT_PNT(P)     (STREAM_PNT(BGP_INPUT(P)))

/* Macro to check BGP information is alive or not.  */
#define BGP_INFO_HOLDDOWN(BI)                         \
  (! CHECK_FLAG ((BI)->flags, BGP_INFO_VALID)         \
   || CHECK_FLAG ((BI)->flags, BGP_INFO_HISTORY)      \
   || CHECK_FLAG ((BI)->flags, BGP_INFO_DAMPED))

/* Count prefix size from mask length */
#define PSIZE(a) (((a) + 7) / (8))

/* BGP error codes.  */
#define BGP_SUCCESS                               0
#define BGP_ERR_INVALID_VALUE                    -1
#define BGP_ERR_INVALID_FLAG                     -2
#define BGP_ERR_INVALID_AS                       -3
#define BGP_ERR_INVALID_BGP                      -4
#define BGP_ERR_PEER_GROUP_MEMBER                -5
#define BGP_ERR_MULTIPLE_INSTANCE_USED           -6
#define BGP_ERR_PEER_GROUP_MEMBER_EXISTS         -7
#define BGP_ERR_PEER_BELONGS_TO_GROUP            -8
#define BGP_ERR_PEER_GROUP_AF_UNCONFIGURED       -9
#define BGP_ERR_PEER_GROUP_NO_REMOTE_AS         -10
#define BGP_ERR_PEER_GROUP_CANT_CHANGE          -11
#define BGP_ERR_PEER_GROUP_MISMATCH             -12
#define BGP_ERR_PEER_GROUP_PEER_TYPE_DIFFERENT  -13
#define BGP_ERR_MULTIPLE_INSTANCE_NOT_SET       -14
#define BGP_ERR_AS_MISMATCH                     -15
#define BGP_ERR_PEER_INACTIVE                   -16
#define BGP_ERR_INVALID_FOR_PEER_GROUP_MEMBER   -17
#define BGP_ERR_PEER_GROUP_HAS_THE_FLAG         -18
#define BGP_ERR_PEER_FLAG_CONFLICT              -19
#define BGP_ERR_PEER_GROUP_SHUTDOWN             -20
#define BGP_ERR_PEER_FILTER_CONFLICT            -21
#define BGP_ERR_NOT_INTERNAL_PEER               -22
#define BGP_ERR_REMOVE_PRIVATE_AS               -23
#define BGP_ERR_AF_UNCONFIGURED                 -24
#define BGP_ERR_SOFT_RECONFIG_UNCONFIGURED      -25
#define BGP_ERR_INSTANCE_MISMATCH               -26
#define BGP_ERR_LOCAL_AS_ALLOWED_ONLY_FOR_EBGP  -27
#define BGP_ERR_CANNOT_HAVE_LOCAL_AS_SAME_AS    -28
#define BGP_ERR_MAX                             -29

extern struct bgp_master *bm;

extern struct thread_master *master;

/* Prototypes. */
void bgp_terminate (void);
void bgp_reset (void);
void bgp_zclient_reset ();
int bgp_nexthop_set (union sockunion *, union sockunion *, 
		     struct bgp_nexthop *, struct peer *);
struct bgp *bgp_get_default ();
struct bgp *bgp_lookup (as_t, const char *);
struct bgp *bgp_lookup_by_name (const char *);
struct peer *peer_lookup (struct bgp *, union sockunion *);
struct peer_group *peer_group_lookup (struct bgp *, const char *);
struct peer_group *peer_group_get (struct bgp *, const char *);
struct peer *peer_lookup_with_open (union sockunion *, as_t, struct in_addr *,
				    int *);
int peer_sort (struct peer *peer);
int peer_active (struct peer *);
int peer_active_nego (struct peer *);
struct peer *peer_create_accept (struct bgp *);
char *peer_uptime (time_t, char *, size_t);
void bgp_config_write_family_header (struct vty *, afi_t, safi_t, int *);

void bgp_master_init ();

void bgp_init ();

int bgp_option_set (int);
int bgp_option_unset (int);
int bgp_option_check (int);

int bgp_get (struct bgp **, as_t *, const char *);
int bgp_delete (struct bgp *);

int bgp_flag_set (struct bgp *, int);
int bgp_flag_unset (struct bgp *, int);
int bgp_flag_check (struct bgp *, int);

int bgp_router_id_set (struct bgp *, struct in_addr *);
int bgp_router_id_unset (struct bgp *);

int bgp_cluster_id_set (struct bgp *, struct in_addr *);
int bgp_cluster_id_unset (struct bgp *);

int bgp_confederation_id_set (struct bgp *, as_t);
int bgp_confederation_id_unset (struct bgp *);
int bgp_confederation_peers_check (struct bgp *, as_t);

int bgp_confederation_peers_add (struct bgp *, as_t);
int bgp_confederation_peers_remove (struct bgp *, as_t);

int bgp_timers_set (struct bgp *, u_int32_t, u_int32_t);
int bgp_timers_unset (struct bgp *);

int bgp_default_local_preference_set (struct bgp *, u_int32_t);
int bgp_default_local_preference_unset (struct bgp *);

int peer_rsclient_active (struct peer *);

int peer_remote_as (struct bgp *, union sockunion *, as_t *, afi_t, safi_t);
int peer_group_remote_as (struct bgp *, const char *, as_t *);
int peer_delete (struct peer *peer);
int peer_group_delete (struct peer_group *);
int peer_group_remote_as_delete (struct peer_group *);

int peer_activate (struct peer *, afi_t, safi_t);
int peer_deactivate (struct peer *, afi_t, safi_t);

int peer_group_bind (struct bgp *, union sockunion *, struct peer_group *,
		     afi_t, safi_t, as_t *);
int peer_group_unbind (struct bgp *, struct peer *, struct peer_group *,
		       afi_t, safi_t);

int peer_flag_set (struct peer *, u_int32_t);
int peer_flag_unset (struct peer *, u_int32_t);

int peer_af_flag_set (struct peer *, afi_t, safi_t, u_int32_t);
int peer_af_flag_unset (struct peer *, afi_t, safi_t, u_int32_t);
int peer_af_flag_check (struct peer *, afi_t, safi_t, u_int32_t);

int peer_ebgp_multihop_set (struct peer *, int);
int peer_ebgp_multihop_unset (struct peer *);

int peer_description_set (struct peer *, char *);
int peer_description_unset (struct peer *);

int peer_update_source_if_set (struct peer *, const char *);
int peer_update_source_addr_set (struct peer *, union sockunion *);
int peer_update_source_unset (struct peer *);

int peer_default_originate_set (struct peer *, afi_t, safi_t, const char *);
int peer_default_originate_unset (struct peer *, afi_t, safi_t);

int peer_port_set (struct peer *, u_int16_t);
int peer_port_unset (struct peer *);

int peer_weight_set (struct peer *, u_int16_t);
int peer_weight_unset (struct peer *);

int peer_timers_set (struct peer *, u_int32_t, u_int32_t);
int peer_timers_unset (struct peer *);

int peer_timers_connect_set (struct peer *, u_int32_t);
int peer_timers_connect_unset (struct peer *);

int peer_advertise_interval_set (struct peer *, u_int32_t);
int peer_advertise_interval_unset (struct peer *);

int peer_interface_set (struct peer *, const char *);
int peer_interface_unset (struct peer *);

int peer_distribute_set (struct peer *, afi_t, safi_t, int, const char *);
int peer_distribute_unset (struct peer *, afi_t, safi_t, int);

int peer_allowas_in_set (struct peer *, afi_t, safi_t, int);
int peer_allowas_in_unset (struct peer *, afi_t, safi_t);

int peer_local_as_set (struct peer *, as_t, int);
int peer_local_as_unset (struct peer *);

int peer_prefix_list_set (struct peer *, afi_t, safi_t, int, const char *);
int peer_prefix_list_unset (struct peer *, afi_t, safi_t, int);

int peer_aslist_set (struct peer *, afi_t, safi_t, int, const char *);
int peer_aslist_unset (struct peer *,afi_t, safi_t, int);

int peer_route_map_set (struct peer *, afi_t, safi_t, int, const char *);
int peer_route_map_unset (struct peer *, afi_t, safi_t, int);

int peer_unsuppress_map_set (struct peer *, afi_t, safi_t, const char *);
int peer_unsuppress_map_unset (struct peer *, afi_t, safi_t);

int peer_maximum_prefix_set (struct peer *, afi_t, safi_t, u_int32_t, u_char, int, u_int16_t);
int peer_maximum_prefix_unset (struct peer *, afi_t, safi_t);

int peer_clear (struct peer *);
int peer_clear_soft (struct peer *, afi_t, safi_t, enum bgp_clear_type);

void peer_nsf_stop (struct peer *);